Shears



(No l vlodel.)

J. YGCOM, Jr.

SHEARS. No. 283,056. Patented Aug. 14, 1883.

FIG. 2.

J9 05" I 1 c WITNESSES:

UNITED STATES PATENT OFFI E.

JAMES YOOOM, JR, or PHILADELPHIA, PENNSYLVANIA.

S HEA'RS, q

I SPECIFICATION forming part of Letters Patent No. 283,056, dated August 14, 1883.

Application filed April 26, 1883. (hlo model.) i

State of Pennsylvania, have invented certain new and useful Improvements in Cutting Shears, of which improvements the following is a specification.

The object of my invention is to enable the blades of a cutting shear to be accurately fitted and firmly held in their respective posi tions, and their normal relation one to the other to be maintained after grinding or sharpening without the employment of packing or liners.

Tothis end my improvements consist in the combination, with a cutting-shear frame and a fixed cutting-blade-seeured thereto, of a cutting-blade secured to a movable jaw pivoted to the frame and a device for effectingthe longitudinal adjustment of said movable jaw relatively to the axis of its pivot," also, in the combination of a cutting-shear frame, a forked movable jaw pivoted thereto, and a series of set-screws engaging said jaw and bearing on .the frame.

The improvements claimed are hereinafter more fully set forth.

In the accompanying drawings, Figure l is a view, in perspective, of a cutting-shear embodying my invention, and Fig. 2 a horizontal section through the frame and movable jaw of the same.

In the practice of my invention I form of cast metal and preferably in one piece a frame, A, having a vertical standard, a, at its top, to

I which is pivoted the socket-piece bof'an op crating-lever, B, said socket also carrying an arm, I), to which is secured a counter-balance,

B. A jaw, O, is coupled at one end by a bolt, 0, to the standard a of the frame and at the other by a link, 0 to the socket-piece b of the operating-lever, so as to be vibrated about the axis of its pivot by the oscillation of said lever in avertical plane. A cnttingblade, c,

is fitted accurately to and secured firmly in a recess slotted out of the movable jaw. C, and a corresponding cutting-blade, c, is similarly fitted and secured in a finished recess in the frame A in such relation to the blade 0 as to enable a shearing cut to beeffccted by the downward movement of the movable jaw.

In shears of the class to which my invention relates, as heretofore constructed, it has been necessary tointerpose packing or liners between the cutting-blades and the surfaces of the frame and movable jaw against which they bear, respectively, in order to effect the adjustment which is required to maintain the blades in proper relation after being ground. The employment of packing is objectionable in the particular that it prevents the attain-1 ment of absolute accuracy and solidity in the fitting and attachment of the cutting-blades, and involves inconvenience and delay in making the proper adjustments thereof. Under. my. invention these objections are obviated by the provision of means of adjustment wholly independent of the connection of the blades and their bearing-surfaces, the relation of which remains invariable; To this end, in the construction shown the movable jaw O is forked at the end adjacent to the framethat isto say, widened out into two lateral extensions or bosses separatedby a central recess the width of which .is such as to embrace the standard a and a washer or facing-plate, 0 located on each side thereof, and in addition to afford sufficient space to admit of the movement of the jaw G longitudinally upon its pivot O toward either side ofthe standard a for such distance as may be required to compensate for the variations of thickness in the cutting-blades resultant upon grinding or sharpening the same. direction is by preference effected by means of set-screws 0 two or more of which engage.

threads in each of the lateral extensions of the jaw and bear at theirends upon the adjacent washer 0*. The washers are made of hard metal, and are interposed as facing-s to pre; vent wear of the frame by the setscrews. It will be seen that by slackening the set-screws on one side, and tightening those on the other to a greater or less degree, the movable jaw may be readily and accurately adjusted in any desired position necessary to maintain the nor mal relation of its cutting-blade c to the cutting-bladed fixed upon the frame. Equiva- -lently the standard a might be recessed in lieu of forming a forked end on the jaw O, and the set-screws 0 would in such case engage the portions of the'standardon each side of the recess. 1, however, regard the construction described and shown as the preferable one.

The movement of the jaw in either.

I claim as my invention and desire to seforth, with a frame, a forked movable jaw piv- 1o eure by Letters Patent oted thereto, of a series of set-screws engag- 1. The combination, substantially as set ing threads in said jaw and adapted to bear forth, with a frame, a cutting-blade secured either directly or intermediately against each 5 vthereto, of a cutting-blade secured to a movaside of the frame.

ble jaw which is pivoted to the franie and ad- JAMES YOOOM, JR. justable transversely upon the axial line of its Vitnesses: pivot. l JAMEs F. M. CHRYSTAL,

WALTER D. Ross.

2, The combination, substantially as set 

